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HERO ID
5020239
Reference Type
Journal Article
Title
Molecular dynamics simulations on the effect of nanovoid on shock-induced phase transition in uranium nitride
Author(s)
Li, YL; Cai, J; Mo, D
Year
2019
Is Peer Reviewed?
1
Journal
Physics Letters. Section A: General, Atomic and Solid State Physics
ISSN:
0375-9601
Volume
383
Issue
5
Page Numbers
458-463
DOI
10.1016/j.physleta.2018.11.017
Web of Science Id
WOS:000456757800011
Abstract
The Angular-Dependent Potential (ADP) proposed by Tseplyaev et al. was used to study the structural behavior of uranium nitride (UN) under shock pressure by molecular dynamics (MD) simulations. Based on the calculations of shock velocity U-S and particle velocity U-P, the results show that a pressure-induced phase transition of Fm - 3m -> R - 3m structure in UN occurs at 35 GPa, and it agrees well with experimental results of 30-32 GPa. We also considered the effect of nanovoid on the phase transition of UN crystal from Fm - 3m to R - 3m structure. It is found that the pressure of phase transition decreases with the increasing nanovoid diameter. The phase transition takes place firstly around nanovoid, companied by the nanovoid collapsing, and then spreads to the void-free regions in the process of shock loading. Due to different stresses at different direction the spreading velocity of phase transition perpendicular to the direction of shock wave is observed to be far faster than the one parallel to the direction of shock wave. (C) 2018 Elsevier B.V. All rights reserved.
Keywords
UN; Nanovoid; Phase transition; Shock pressure; MD
Tags
IRIS
•
Uranium
Uranium Literature Search Update 4/2020
WOS
•
Uranium Toxicological Review
Date limited literature search 2011-2021
WOS
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